install ffmpeg for torch >= 2.1.0

.github/scripts/docker/Dockerfile

@@ -12,6 +12,7 @@ ARG _KALDIFEAT_VERSION="${KALDIFEAT_VERSION}+cpu.torch${TORCH_VERSION}"
 
 RUN apt-get update -y && \
     apt-get install -qq -y \
+    ffmpeg \
     git \
     git-lfs \
     less \

.github/workflows/build-cpu-docker.yml

@@ -2,7 +2,7 @@ name: build-cpu-docker
 on:
   push:
     branches:
-      - ci-train-3
+      - ci-train-2
   workflow_dispatch:
 
 concurrency:

.github/workflows/train-librispeech.yml

@@ -3,7 +3,7 @@ on:
   push:
     branches:
       - master
-      - ci-train-2
+      - ci-train-3
 
   pull_request:
     branches: